release/src-rt-6.x/linux/linux-2.6/arch/cris/arch-v32/boot/compressed/misc.c

   1 /*
   2  * misc.c
   3  *
   4  * $Id: misc.c,v 1.8 2005/04/24 18:34:29 starvik Exp $
   5  *
   6  * This is a collection of several routines from gzip-1.0.3
   7  * adapted for Linux.
   8  *
   9  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
  10  * puts by Nick Holloway 1993, better puts by Martin Mares 1995
  11  * adoptation for Linux/CRIS Axis Communications AB, 1999
  12  *
  13  */
  14
  15 /* where the piggybacked kernel image expects itself to live.
  16  * it is the same address we use when we network load an uncompressed
  17  * image into DRAM, and it is the address the kernel is linked to live
  18  * at by vmlinux.lds.S
  19  */
  20
  21 #define KERNEL_LOAD_ADR 0x40004000
  22
  23
  24 #include <linux/types.h>
  25 #include <asm/arch/hwregs/reg_rdwr.h>
  26 #include <asm/arch/hwregs/reg_map.h>
  27 #include <asm/arch/hwregs/ser_defs.h>
  28
  29 /*
  30  * gzip declarations
  31  */
  32
  33 #define OF(args)  args
  34 #define STATIC static
  35
  36 void* memset(void* s, int c, size_t n);
  37 void* memcpy(void* __dest, __const void* __src,
  38              size_t __n);
  39
  40 #define memzero(s, n)     memset ((s), 0, (n))
  41
  42
  43 typedef unsigned char  uch;
  44 typedef unsigned short ush;
  45 typedef unsigned long  ulg;
  46
  47 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  48                                 /* and a power of two */
  49
  50 static uch *inbuf;           /* input buffer */
  51 static uch window[WSIZE];    /* Sliding window buffer */
  52
  53 unsigned inptr = 0;     /* index of next byte to be processed in inbuf
  54                          * After decompression it will contain the
  55                          * compressed size, and head.S will read it.
  56                          */
  57
  58 static unsigned outcnt = 0;  /* bytes in output buffer */
  59
  60 /* gzip flag byte */
  61 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
  62 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  63 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  64 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  65 #define COMMENT      0x10 /* bit 4 set: file comment present */
  66 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  67 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  68
  69 #define get_byte() inbuf[inptr++]
  70
  71 /* Diagnostic functions */
  72 #ifdef DEBUG
  73 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  74 #  define Trace(x) fprintf x
  75 #  define Tracev(x) {if (verbose) fprintf x ;}
  76 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  77 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  78 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  79 #else
  80 #  define Assert(cond,msg)
  81 #  define Trace(x)
  82 #  define Tracev(x)
  83 #  define Tracevv(x)
  84 #  define Tracec(c,x)
  85 #  define Tracecv(c,x)
  86 #endif
  87
  88 static int  fill_inbuf(void);
  89 static void flush_window(void);
  90 static void error(char *m);
  91 static void gzip_mark(void **);
  92 static void gzip_release(void **);
  93
  94 extern char *input_data;  /* lives in head.S */
  95
  96 static long bytes_out = 0;
  97 static uch *output_data;
  98 static unsigned long output_ptr = 0;
  99
 100 static void *malloc(int size);
 101 static void free(void *where);
 102 static void error(char *m);
 103 static void gzip_mark(void **);
 104 static void gzip_release(void **);
 105
 106 static void puts(const char *);
 107
 108 /* the "heap" is put directly after the BSS ends, at end */
 109
 110 extern int _end;
 111 static long free_mem_ptr = (long)&_end;
 112
 113 #include "../../../../../lib/inflate.c"
 114
 115 static void *malloc(int size)
 116 {
 117         void *p;
 118
 119         if (size <0) error("Malloc error");
 120
 121         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 122
 123         p = (void *)free_mem_ptr;
 124         free_mem_ptr += size;
 125
 126         return p;
 127 }
 128
 129 static void free(void *where)
 130 {       /* Don't care */
 131 }
 132
 133 static void gzip_mark(void **ptr)
 134 {
 135         *ptr = (void *) free_mem_ptr;
 136 }
 137
 138 static void gzip_release(void **ptr)
 139 {
 140         free_mem_ptr = (long) *ptr;
 141 }
 142
 143 /* decompressor info and error messages to serial console */
 144
 145 static inline void
 146 serout(const char *s, reg_scope_instances regi_ser)
 147 {
 148         reg_ser_rs_stat_din rs;
 149         reg_ser_rw_dout dout = {.data = *s};
 150
 151         do {
 152                 rs = REG_RD(ser, regi_ser, rs_stat_din);
 153         }
 154         while (!rs.tr_rdy);/* Wait for tranceiver. */
 155
 156         REG_WR(ser, regi_ser, rw_dout, dout);
 157 }
 158
 159 static void
 160 puts(const char *s)
 161 {
 162 #ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
 163         while (*s) {
 164 #ifdef CONFIG_ETRAX_DEBUG_PORT0
 165                 serout(s, regi_ser0);
 166 #endif
 167 #ifdef CONFIG_ETRAX_DEBUG_PORT1
 168                 serout(s, regi_ser1);
 169 #endif
 170 #ifdef CONFIG_ETRAX_DEBUG_PORT2
 171                 serout(s, regi_ser2);
 172 #endif
 173 #ifdef CONFIG_ETRAX_DEBUG_PORT3
 174                 serout(s, regi_ser3);
 175 #endif
 176                 *s++;
 177         }
 178 /* CONFIG_ETRAX_DEBUG_PORT_NULL */
 179 #endif
 180 }
 181
 182 void*
 183 memset(void* s, int c, size_t n)
 184 {
 185         int i;
 186         char *ss = (char*)s;
 187
 188         for (i=0;i<n;i++) ss[i] = c;
 189 }
 190
 191 void*
 192 memcpy(void* __dest, __const void* __src,
 193                             size_t __n)
 194 {
 195         int i;
 196         char *d = (char *)__dest, *s = (char *)__src;
 197
 198         for (i=0;i<__n;i++) d[i] = s[i];
 199 }
 200
 201 /* ===========================================================================
 202  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 203  * (Used for the decompressed data only.)
 204  */
 205
 206 static void
 207 flush_window()
 208 {
 209     ulg c = crc;         /* temporary variable */
 210     unsigned n;
 211     uch *in, *out, ch;
 212
 213     in = window;
 214     out = &output_data[output_ptr];
 215     for (n = 0; n < outcnt; n++) {
 216             ch = *out++ = *in++;
 217             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 218     }
 219     crc = c;
 220     bytes_out += (ulg)outcnt;
 221     output_ptr += (ulg)outcnt;
 222     outcnt = 0;
 223 }
 224
 225 static void
 226 error(char *x)
 227 {
 228         puts("\n\n");
 229         puts(x);
 230         puts("\n\n -- System halted\n");
 231
 232         while(1);       /* Halt */
 233 }
 234
 235 void
 236 setup_normal_output_buffer()
 237 {
 238         output_data = (char *)KERNEL_LOAD_ADR;
 239 }
 240
 241 static inline void
 242 serial_setup(reg_scope_instances regi_ser)
 243 {
 244         reg_ser_rw_xoff xoff;
 245         reg_ser_rw_tr_ctrl tr_ctrl;
 246         reg_ser_rw_rec_ctrl rec_ctrl;
 247         reg_ser_rw_tr_baud_div tr_baud;
 248         reg_ser_rw_rec_baud_div rec_baud;
 249
 250         /* Turn off XOFF. */
 251         xoff = REG_RD(ser, regi_ser, rw_xoff);
 252
 253         xoff.chr = 0;
 254         xoff.automatic = regk_ser_no;
 255
 256         REG_WR(ser, regi_ser, rw_xoff, xoff);
 257
 258         /* Set baudrate and stopbits. */
 259         tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
 260         rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
 261         tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
 262         rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
 263
 264         tr_ctrl.stop_bits = 1;  /* 2 stop bits. */
 265
 266         /*
 267          * The baudrate setup is a bit fishy, but in the end the tranceiver is
 268          * set to 4800 and the receiver to 115200. The magic value is
 269          * 29.493 MHz.
 270          */
 271         tr_ctrl.base_freq = regk_ser_f29_493;
 272         rec_ctrl.base_freq = regk_ser_f29_493;
 273         tr_baud.div = (29493000 / 8) / 4800;
 274         rec_baud.div = (29493000 / 8) / 115200;
 275
 276         REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
 277         REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
 278         REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
 279         REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
 280 }
 281
 282 void
 283 decompress_kernel()
 284 {
 285         char revision;
 286
 287         /* input_data is set in head.S */
 288         inbuf = input_data;
 289
 290 #ifdef CONFIG_ETRAX_DEBUG_PORT0
 291         serial_setup(regi_ser0);
 292 #endif
 293 #ifdef CONFIG_ETRAX_DEBUG_PORT1
 294         serial_setup(regi_ser1);
 295 #endif
 296 #ifdef CONFIG_ETRAX_DEBUG_PORT2
 297         serial_setup(regi_ser2);
 298 #endif
 299 #ifdef CONFIG_ETRAX_DEBUG_PORT3
 300         serial_setup(regi_ser3);
 301 #endif
 302
 303         setup_normal_output_buffer();
 304
 305         makecrc();
 306
 307         __asm__ volatile ("move $vr,%0" : "=rm" (revision));
 308         if (revision < 32)
 309         {
 310                 puts("You need an ETRAX FS to run Linux 2.6/crisv32.\n");
 311                 while(1);
 312         }
 313
 314         puts("Uncompressing Linux...\n");
 315         gunzip();
 316         puts("Done. Now booting the kernel.\n");
 317 }